Improvement in carriage-jacks



.PATENT OFFICE.

` AUGUST H. wELLBRooK, oEBoSToN, MASSACHUSETTS.

" IMPROVEMENT IN CRRIAGE-JAcKs.

Speciicationforming part of Letters Patent No. 115,140, dated May 23, 1871.

To all whom it may concern:

Be it known that I, AUGUST II. WELL- BRocK, of Boston, in the county of Suffolk and State of Massachusetts, haveinvented an Improved Carriage-J ack 5 and I do hereby declare that the following, taken in connection with the drawing which accompanies and forms part of this specification, isa description of my invention sufficient to enable those skilled in the art to practice it. j

The invention relates to the construction or arrangement of the mechanism of that class of carriage-jacks in which a vertically-sliding lifter is employed, said lifter being raised by a long handle or lever fulcrnmed near one end in the post, by which "the lifter is supported laterally. In my improved jack I use a looselysliding and removable lifter, resting upon a lever or upon a friction-roll interposed between such lever and the foot of the litter, the rear end of the lever being fulcrumed in the post land its front end being connected, by a suitable chain or cord, to the handle or lever by which the rise of the lifter is effected, the arrangement of the parts constituting my invention.

The drawing represents a carriage-jack elnbodying the improvement.

Ashows a sectional elevation of the jack. B, a plan of it.

a denotes a base, into which areframed two uprights or posts, b b, by which the lifter c is supportedlaterally, and between which said lifter slides. The upper end 'of the lifter is made with a series of steps, o, to adapt it to axles of varying height; and the lifter rests upon a friction-roll, d, placed under it, as seen at A, this roll being pivoted in the end of a short arm or lever, c, hung to the upright b. The roll rests upon a lever, f, fulcrumed at its rear end to the upright b, and extending out toward the front of the uprights, where its front end is suspended from the handle or le ver gby a suitable chain or rope, h. `The short end of the lever gis formed with anu eccentric, fi, upon a guidegroove, in the periphery ot' which the rope winds as the lever is depressed,

the lever g being fulcrumed to theuprights, as"

seen at lc. N ormall y, or when the lifter is down, the llevers are in the position denoted by the full black lines at A; and by throwing the long arm of the lever g down into the position seen by the dotted lines the lifter is raised, all the parts assuming the positions shown by the dot Y ted lines.

By fulcruming the lever g, as shown, and using the chain or rope 1L and lever f Ato connect the operating lever or handle with the lifter, I obtain advantage of the compound leverage afforded by the two levers; and by supporting and operating the lifter, as showlj, Vmakin g no jointed connection of it to the lever, the lifter when worn can be readily replace without the aid ofan artisan. i To retain the lifter in raised position a button, I, is used, this button having notches which allow the end of' the handle to sink to the base a., while, by turning the button, the handle is locked from back movement, without which movement it cannot rise.

I claiml. The lever y, lifter c, lever f, and connect- Aing-chain or cord h, whenccmbined and arrangedl to `operate together, :substantially as described.

2. In combination with the lifter c and levell f, the interposed Vswinging arm e carrying at its free end a friction-roll, d, bea-ring both up on the lever and the lifter, substantially asdef scribed.

Witnesses:

J. B. CROSBY, L. H. LATIMER.

AUGUST H; WEILBROCK. 

